Sahih Muslim Book 42, Hadith Number 7123.

Chapter : The Punishment of one who Commands others to do good but does not do it himself and he forbids others to do evil but does not himself refrain from it.

Abu Wa’il reported: I was in the company of Usama b. Zaid that a person said: What prevents you to visit Uthman and talk to him for what he does? The rest of the hadith is the same.